Expansible annular packing.



G. BERGGREN.

EXPANSIBLE ANNULAR PACKING.

Awucmma man APR. 5. 1918.

1 ,283,46 1 Patent@ vv. 5, 1918.

GUSTAF BEBGGREN, OF BROOKLYN, NEW YORK.

EXPANSIIBLE ANNULAR PACKING.

Specification of Letters Patent Patented Nov. 5, 1918.

Application tiled April 5, 1918. Serial No. 226,864.

Toallwhomtma concern.' V

Be it known t at I, GUSTAF BEn'GonnN, a citizen of the United States, and a resident of the boron h of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Expansible Annuler Packings, of which the following is a specification.

My invention relates to annular expansible aokin' s for pistons, valve heads, and the ihn, `w lich are subjected to fiuid pressure, and the object is to elfectually exclude such fluid pressure from the packing rings, and especially from the rear thereof. so as to ohviate leakage and internal pressure, and thereb reduce peripheral, frictional contact ofp the rings with the concave cylindrical surfaces to which they are opposed in action, all as hereinafter fully set forth,- the invention consisting in the specific construction and arrangement of parts herein described and claimed,-distinctiveV features being the use of three contact rings in conjunction with an expansible ring; in the method of isolating the latter; -and in the method of permanently positioning the ring splits in equidistant relationship to each other, so as to practically seal the rings against the admission therein-betwcen of the fluid power pressure.

In the accompanying drawings,

Figure 1, is a sectional elevation of a piston head or equivalent provided with 1n lmproved packing means, the key dowe s being omitted;

Fig. 2, is an elevation taken upon plane of line 2 2, Fig. 1, the end cap or follower plate being omitted;

Fig. 3, is a section taken upon plane of line 3-3, Fig. 1;

Fig. 4, is a sectional elevation taken upon plane of line 4--4, Fig. 1;`

Fig. 5, is a sectlona detail upon a larger scale, taken upon plane of line 5-5, Fig. 2;

6, is a like sectional detail taken upon plane of line 6 6, Fig. 4;

Fig. 7, is an annular sectional detail taken upon plane of line 7 7, Fi 4;

Fig. 8, is an edge View o one of the side packing rings;

Fig. 9, is a y pheral view of a portion of the yhase ring showing the oifset split therein.

The piston head H, is formed with an annular shoulder It, projecting beyond, and at right angles to, the cylindrical packing sont h', which is of a width equal to that of the floating base ring b, which latter is of such interior diameter as to afford a space s, hetwcer it and said cylindrical seat h', suliicient to compensate for, and allow the packing lo adapt itself to, any slight variations or'incqualities of the surfaces with which the outer packing rings a, c, a, contact peripheral ly.

The edges of the expansible ring are of less thickness than the medial portion thereof, forming seats 7)', for the side acking rings c, c, said seats b', having s oulders b2, which overlap the inner edges of said side rings c, e', as shown more particularly in Figs. 1 and 7. The ring b, is `split transversely, as at b", Figs. 3 and 9, the split bein preferably offset as shown to form the lap b3, although this is not essential, since the well known straight diagonal split may` be substituted if desired. The central lap 7), however is effective in preventing the passage of fluid pressure through the packing.

The side rings c, c", are L-shaped or rectangular in cross section, consisting of the flanges c',- and seats c2, for the reception of the edges c', of the main. or central contactual ring a. Each side rin c, c", is s lit as at c, and these splits are al: although not necessarily, offset, as in the case of the expansible ring b, and for the same reason, thereby forming close longitudinal laps c4, one o which is shown in Fig. 8. For the same purpose and reason the central bearing ring a, is in like manner formed preferably with an offset split a', having a close central lap a, shown more particularly in Fig. 1.

Each of the four elastic resilient expansible rings a, b, c, c", being thus split transversely, either with a diagonal or oifset cut, the several splits ,pre arranged and spaced apart in equldistat relationshi as related to each other and to the piston cad. That is to saythe arran ment is `:qundrangular. For instance, as re ated to the arts shown in Figs. 1, 2,13, an 4, ofthe i rawings, the split o! of t couter 51de ring c", is at the top; that a) of the mediaihearso prefere 1X,

osition of f 3W between' said rin and member, said ring locking with the ring and the side rings for having shoulder-e seats at opposite edges, preventing a shifting of the rings upon and L-sha ed side Contact rings positioned on with relation to each other.

said s ouldered seats, a medial Contact ring GUSTAF BERGGREN. Ihresbing upon the said ring and shouldered `Witnesses:

at? its edges and positioned on the shouldered Gro. 7.31. Murr,

seats of. @he side rings and key dowels inter- DoRoTuY MIA'I'I. 

